/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Globalization;
using System.Reflection;
using System.Resources;
using EffiProzDB.Lib;

namespace EffiProzDB.Resources
{

    /**
     * A ResourceBundle helper class. <p>
     *
     * Allows clients to get/set locale and get at localized resource bundle
     * content in a resource path independent manner, without having to worry
     * about handling exception states or deal directly with ResourceBundle
     * object instances. Instead, clients recieve numeric handles to the
     * underlying objects.  Rather than causing exception states, missing or
     * inaccessible resources and underlying MissingResource and NullPointer
     * exceptions result in null return values when attempting to retrieve a
     * resource. <p>
     *
     * @author boucherb@users
     * @version 1.7.2
     * @since 1.7.2
     */
    public sealed class BundleHandler
    {

        /** Used to synchronize access */
        private static Object mutex = new Object();

        /** The Locale used internally to fetch resource bundles. */
        private static CultureInfo locale = CultureInfo.CurrentCulture;

        /** Map:  Integer object handle => <code>ResourceBundle</code> object. */
        private static Dictionary<string, int> bundleHandleMap = new Dictionary<string, int>();

        /** List whose elements are <code>ResourceBundle</code> objects */
        private static List<ResourceManager> bundleList = new List<ResourceManager>();

        /**
         * The resource path prefix of the <code>ResourceBundle</code> objects
         * handled by this class.
         */
        private const String prefix = "System.Data.EffiProzDB.Resources.";


        /** Pure utility class: external construction disabled. */
        private BundleHandler() { }

        /**
         * Getter for property locale. <p>
         *
         * @return Value of property locale.
         */
        public static CultureInfo getLocale()
        {


            lock (mutex)
            {
                return locale;
            }
        }

        /**
         * Setter for property locale. <p>
         *
         * @param l the new locale
         * @throws IllegalArgumentException when the new locale is null
         */
        public static void setLocale(CultureInfo l)
        {

            lock (mutex)
            {
                if (l == null)
                {
                    throw new ArgumentException("null locale");
                }

                locale = l;
            }
        }

        /**
         * Retrieves an <code>int</code> handle to the <code>ResourceBundle</code>
         * object corresponding to the specified name and current
         * <code>Locale</code>, using the specified <code>ClassLoader</code>. <p>
         *
         * @return <code>int</code> handle to the <code>ResourceBundle</code>
         *        object corresponding to the specified name and
         *        current <code>Locale</code>, or -1 if no such bundle
         *        can be found
         * @param cl The ClassLoader to use in the search
         * @param name of the desired bundle
         */
        public static int getBundleHandle(String name, Assembly cl)
        {

            int bundleHandle = -1;
            ResourceManager bundle;


            lock (mutex)
            {
                string bundleKey = prefix + name;
         

                if (!bundleHandleMap.TryGetValue(bundleKey, out bundleHandle))
                {
                    try
                    {

                        bundle = getBundle(bundleKey, cl);
                        bundleList.Add(bundle);
                        bundleHandle = bundleList.Count - 1;
                        bundleHandleMap.Add(bundleKey, bundleHandle);

                    }
                    catch (Exception )
                    {
                        bundleHandle = -1;
                        //e.printStackTrace();
                    }
                }
            }

            return bundleHandle ;
        }

        /**
         * Retrieves, from the <code>ResourceBundle</code> object corresponding
         * to the specified handle, the <code>String</code> value corresponding
         * to the specified key.  <code>null</code> is retrieved if either there
         *  is no <code>ResourceBundle</code> object for the handle or there is no
         * <code>String</code> value for the specified key. <p>
         *
         * @param handle an <code>int</code> handle to a
         *      <code>ResourceBundle</code> object
         * @param key A <code>String</code> key to a <code>String</code> value
         * @return The String value correspoding to the specified handle and key.
         */
        public static String getString(int handle, String key)
        {

            ResourceManager bundle;
            String s;

            lock (mutex)
            {
                if (handle < 0 || handle >= bundleList.Count || key == null)
                {
                    bundle = null;
                }
                else
                {
                    bundle = (ResourceManager)bundleList[(handle)];
                }
            }

            if (bundle == null)
            {
                s = null;
            }
            else
            {
                try
                {
                    if (locale == null)
                        s = bundle.GetString(key);
                    else
                        s = bundle.GetString(key, locale);
                }
                catch (Exception )
                {
                    s = null;
                }
            }

            return s;
        }



        /**

         *
         * @param name the base name of the resource bundle, a fully
         *      qualified class name
         * @param locale the locale for which a resource bundle is desired
         * @param cl the class loader from which to load the resource bundle
         */
        public static ResourceManager getBundle(String name,
                                               Assembly cl)
        {

            if (cl != null)
            {
                return new ResourceManager(name, cl);
            }
            else
            {
                return new ResourceManager(name, Assembly.GetExecutingAssembly());
            }

        }
    }
}
